Effects of pulsewidth on two-photon polymerization

In this paper, the effect of pulsewidth on two-photon polymerization is reported. Free standing walls of micrometer width were generated using a femtosecond laser irradiation of the highly photosensitive Ormocomp. It was found that at constant laser fluence and a constant number of pulses pulsewidth has great influence on the polymerization process. The volume of the polymerized voxel is linearly proportional to pulsewidth, so is the polymerization threshold fluence; and linewidth increases with the increase of pulsewidth. These phenomena can be explained by the pulsewidth-dependent two-photon cross section and temperature-dependent radical diffusion.